Morphological approach

* Special staining and  clearing techniques make it possible to interpret  the organization of complex structures & the ratherm obscure & ephemeral events of the sexual cycle

* Without exceptions to date, molecular phylogenetic analyses seem to highlight the evolution of the earliest stages in the development of the female apparatus and associated cells. 

* The molecular-based phylogenies each provide an independent test of classification to the one based on morphological or ultrastructural evidence.

* Besides elucidating relationships, phylogenetic hypotheses inferred  from gene sequence data provide the critical framework for studies of morphological character evolution and life history evolution  

dept. biology, university of louisiana at Lafayette, Lafayette LA 70504-3601;  tel: 337/482-1291 & 482-5057